HI GUYS I HAVE O2 XDA2I BUT I DONT KNOW WHAT IS THAT MEAN YOUR BATERY BACKUP IS %100? WHEN MY BATERY GETTING LOW MY XDA DEVICE IS TURNING OFF. BUT MY BACK UP IS STILL %100 I DONT KNOW CAN I USE MY BATTERY BACK UP FORMY DEVICE? THAT BACKUP OPTION DOESE IT HAVE ANY USE FOR MY XDA 2I OR WHAT? PLEASE GUYS HELP ME IM ROOKIE. WHAT IS BATERY BACKUP USE FOR?